Ventilator



W. L. WASHBURN. SELF, REGULATING VENTILATOR.

No. 32,730. Patented July 2 1861 UNITED STATES PATENT OFFICE.

XVILLIAM L. IVASHBURN, OF SPRINGFIELD, MASSACHUSETTS.

VENTILATOR.

Specification of Letters Patent No. 82,730, dated. July 2, 1861.

To all whom it may concern:

Be it known that I, WILLIAM L. lVasi-i- BURN, of Springfield, in thecounty of Hampden, in the State of Massachusetts, have invented a newand useful Ventilator for Dwellingllouses, Churches, Halls, &c.; and Ido hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,making part of this specification, in which- Figure l, is a perspectiveview of a window with my improvement attached. Fig. 2, is a verticaltransverse section of the ventilator and adjacent portions of thewindow, sash and frame.

Similar letters of reference indicate corresponding parts in bothfigures.

The object of my invention to provide a ventilator susceptible of readyadjustment, self regulating by the force of air and adapted to protectthe inmates of rooms in which it is used from sudden and direct drafts.

My invention consists in a certain combination of flanged shelf and flapvalve operating in connection with a window sash in manner hereinaftermore fully explained.

To enable others skilled in the art to make and use my invention I willproceed to describe its construction and operation.

A, represents the window frame, and B, B, the sashes, C, is a horizontalshelf secured at the upper part of the sash and provided with a verticalflange D, as clearly shown in Fig. 2; E, is a flap valve hinged to theframing above the shelf C. The shelf C, D, and valve E, reach completelyacross the window from side to side and may be secured in any suitablemanner, but it is preferred to fit the shelf in grooves in the j amb bywhich means it may be readily adjusted to any desired height.

In using the apparatus the upper sash is lowered to any desired extent(as illustrated in Fig. 2) and a circuitous aperture thereby formed topermit the escape of 1102; ious gases from the room or admit fresh airfrom without. By the deflection of the current, inmates of the room areeffectually protected from sudden or direct drafts and in the event ofan undue external pressure the swinging valve will partially or entirelyclose so as to automatically regulate the capacity of the aperture tocorrespond with the force of the current and as the pressure subsideswill return to its former position. The outer surface of the valve maybe made concave to cause the air to act upon it with greater effect.

The ventilator may be placed either on the insice or outside of thewindow as preferred.

I am aware that swinging valves in vari ous forms have been employed forpurposes of ventilation, but

What I claim as new and desire to secure by Letters Patent, is,

The combination of the flanged shelf C, D, and hinged valve F, with thewindow A, B, the whole being constructed and arranged in the manner andfor the purpose herein shown and explained.

In testimony whereof I hereunto set my hand this eleventh day of JanuaryA. I). one thousand eight hundred and sixty.

WILLIAM L. NASHIBURN.

lVitnesses:

FRANCIS Fnars, E. l/V. DICKINSON.

